skyeagle/nested_set perceived as invalid git repo (yes, another one)

Hi there! I'm trying to add
git://github.com/skyeagle/nested_set.git, but I'm getting an
"invalid git repo" message for some reason. Can you guys help? Also
can you share some background as to why it's failing? I get the
sense that this happens often...

The error messages aren't very transparent right now, and could
be a bit more informative. Basically that's the error you encounter
whenever there was trouble cloning the git repo that an admin needs
to look into (or if the repo source is invalid).

At one point this was happening frequently because we had maxed
out the inodes on the host filesystem (causing disk full errors)
and had rake cleaning tasks running intermittently. We just
migrated to a new filesystem last week though, so problems should
be less frequent.